[C2] What is the Problem - Is it a dog??
01-04-2018, 09:52 PM
#1
Drifting
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What is the Problem - Is it a dog??
I have a 65 that is an orginal 327/300hp. It has been bored 30 over, has headers, Edelbrock aluminum E street heads, Edelbrock intake and carb, and 3:55 POSI WITH A 5 SPD tremec, but it feels like a dog to me! It does not sound like its winding out and it does not put me back in the seat at full throttle. I'm used to the power of a 345 hp ZZ3 crate motor in a Pontiac Fiero, but I think this engine should be close since they both weigh about the same. Am I expecting too much of the 327??
Last edited by TCKT B8; 01-04-2018 at 09:53 PM.
01-04-2018, 10:56 PM
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TCKT B8 (01-05-2018)
01-05-2018, 07:03 AM
#5
Team Owner
The car will never be an asphalt-eating beast but it should give peppy, even snappy performance with the setup you have. My stock 250hp mill isn't a dog...
I can't say if your expectations are too high or you have something misconfigured. The car should be able to break the tires loose from a stop and accelerate smoothly up to redline with a decent feeling of speed. The 5 speed Tremec should give you a nice ratio for performance; particularly with a 3:55 rear... My 61 283 270hp car with a 3.70 was surprisingly stout with the 5 speed and no slouch by any means.
The distributor is certainly one place to begin looking and I'm also not a fan of those one-size-fits all Edelbrock carbs unless they've been tweaked...
I can't say if your expectations are too high or you have something misconfigured. The car should be able to break the tires loose from a stop and accelerate smoothly up to redline with a decent feeling of speed. The 5 speed Tremec should give you a nice ratio for performance; particularly with a 3:55 rear... My 61 283 270hp car with a 3.70 was surprisingly stout with the 5 speed and no slouch by any means.
The distributor is certainly one place to begin looking and I'm also not a fan of those one-size-fits all Edelbrock carbs unless they've been tweaked...
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TCKT B8 (01-05-2018)
01-05-2018, 07:20 AM
#6
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Have you checked to make sure the secondaries on the carb are opening?
01-05-2018, 07:26 AM
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01-05-2018, 07:32 AM
#8
Drifting
you say your used to driving a 345hp Fiero, Look at how the motor is positioned transversely in the Fiero, its almost like direct drive with no transient driveline HP loss compared to the Corvette. Seems like you have the right parts except for the cam, you didn't state what it was. I think the right cam and a bit of fine tune and you would be a happy camper.
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TCKT B8 (01-05-2018)
01-05-2018, 10:18 AM
#9
Could be any one of the things the guys have already mentioned or nothing at all. As Frankie stated, expectations could play into if you’re used to a hotrod Fiero. When I first got my 65 Conv (about 18yrs ago now) which has an L76 it ran terrible compared to my 65 Coupe with an L79. It just wouldn’t accelerate. After tearing into I found Bubba had removed the weights off the distributor….. Guess he knew something the GM engineers didn’t. Best advice I can give is to stick with it, look at one system (Fuel, Spark) at a time and make sure they are what they need to be. The car should be pretty zippy...
01-05-2018, 10:25 AM
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If you're going to go down a possibly spendy path, I would at least start out with some data.
Like a 0-60mph timing, or a 1/4 mile time slip. Or a chassis dyno. Or at least drive or ride in a local C2 with the same engine/transmission as a second check.
Maybe it's just gut feel, or maybe the car has a real set-up problem, who knows.
Like a 0-60mph timing, or a 1/4 mile time slip. Or a chassis dyno. Or at least drive or ride in a local C2 with the same engine/transmission as a second check.
Maybe it's just gut feel, or maybe the car has a real set-up problem, who knows.
01-05-2018, 11:08 AM
#11
Race Director
While we are all guessing on the subject and waiting for the OP to report back with more details:
Please add checking the throttle linkage to make sure it's adjusted to open your carburetor fully.
Please add checking the throttle linkage to make sure it's adjusted to open your carburetor fully.
01-05-2018, 11:11 AM
#12
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Another "what cam?" here. It's the heart of any engine and will make or break a build.
01-05-2018, 11:23 AM
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If you're going to go down a possibly spendy path, I would at least start out with some data.
Like a 0-60mph timing, or a 1/4 mile time slip. Or a chassis dyno. Or at least drive or ride in a local C2 with the same engine/transmission as a second check.
Maybe it's just gut feel, or maybe the car has a real set-up problem, who knows.
Like a 0-60mph timing, or a 1/4 mile time slip. Or a chassis dyno. Or at least drive or ride in a local C2 with the same engine/transmission as a second check.
Maybe it's just gut feel, or maybe the car has a real set-up problem, who knows.
Guessing at everything won't work.
01-05-2018, 11:30 AM
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If you're going to go down a possibly spendy path, I would at least start out with some data.
Like a 0-60mph timing, or a 1/4 mile time slip. Or a chassis dyno. Or at least drive or ride in a local C2 with the same engine/transmission as a second check.
Maybe it's just gut feel, or maybe the car has a real set-up problem, who knows.
Like a 0-60mph timing, or a 1/4 mile time slip. Or a chassis dyno. Or at least drive or ride in a local C2 with the same engine/transmission as a second check.
Maybe it's just gut feel, or maybe the car has a real set-up problem, who knows.
Guessing at everything won't work.
01-05-2018, 11:54 AM
#15
Le Mans Master
If it has the stock 300 HP cam, that's the problem. Great street cam, idles at 500 RPM with lots of low end torque but quits pulling hard at 4000 RPM. The rest of his components are fine.
01-05-2018, 12:10 PM
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Also, what cfm is the carb? Over 600/650 may be too big.
01-05-2018, 01:20 PM
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